A casino is a public room or building where gambling games are played. The games played in casinos are usually based on chance and involve some element of skill. Casinos often include other entertainment options, such as restaurants and bars. Some also have exhibition areas for live performances. Casinos may be combined with hotels and resorts.

During the 1990s, casinos dramatically increased their use of technology for game supervision. These advances were made possible by computer and video camera systems. The casinos used these technologies to monitor the game play of each table minute-by-minute and to spot any anomaly; for example, roulette wheels are electronically monitored on a regular basis to discover any statistical deviations from their expected results. These techniques are called gaming analysis and are performed by mathematicians who are employed in the industry.

Modern casino security is generally divided between a physical security force and a specialized surveillance department. Due to the large amounts of money handled within a casino, both patrons and employees may be tempted to cheat or steal. This is why casinos are heavily armed and have numerous surveillance cameras. In addition, the personnel in casinos is trained to be alert for any suspicious activity.

Those who win large sums of money at casinos are often subject to federal income tax withholding, as well as state taxes. The rules regarding gambling winnings and losses vary by jurisdiction, but in general, the most important thing is to keep detailed records of your wins and losses.